SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770b8f13dd8229a320cf790c6323649d6069bf3c69ac6af56ec4ae93ad01482a' 
  AND token = 'fjAib7+IrgHwv3zuDPOVirbDLjdB1mPX790F/hJRPIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}